If the Secondary Air Pumps are low then I would guess water or ice in the
system stopping air flow possibly due to other issues.
"JimA8L2001" <jim.rodgers@[EMAIL PROTECTED]
> wrote in message
news:dc6e8c71-6188-41d6-9c41-b5b2f7851853@[EMAIL PROTECTED]
> I'm getting codes 0491 & 0492 which are right and left bank secondary
> air system failures.
>
> Once the engine is warm, if i clear the code. They don't come back.
> If it is really cold, I get the code shortly after starting, but again
> if I clear it, it won;t come back.
>
> Without Audi specific test equipment, what can I do to trouble shoot?
>
> Fuse is good, vacuum lines all look good.
>
> The other components are the blower, ECM, Solinoid, combi-valves. I
> get both the righ and left banks so I believe it to be a fault in a
> part of the system that will throw both faults. Don;t think it could
> be a simultaneous right and left combi-valve failure.
>
> No other codes. 2001 A8L, 4.2L AUX Engine.
>
> Any thoughts?
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